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A043110
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Numbers k such that 1 and 2 occur juxtaposed in the base-5 representation of k but not of k-1.
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0
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7, 11, 32, 35, 55, 61, 82, 86, 107, 111, 132, 136, 157, 160, 175, 207, 211, 232, 236, 257, 261, 275, 305, 311, 332, 336, 357, 361, 382, 386, 407, 410, 430, 436, 457, 461, 482, 486, 507, 511, 532, 535, 555, 561, 582, 586, 607, 611
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 5], {1, 2}]>0 || SequenceCount[IntegerDigits[n, 5], {2, 1}]>0, 1, 0], {n, 700}], {0, 1}][[All, 2]] (* Harvey P. Dale, Jan 14 2022 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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